As I posted in that thread, I think this is probably just more hysteria.
I am of the belief that when they strike, it will likely be very apparent. How many times has a scare been followed up with an explosion?
Seems this flight had a note indicating bomb on board.
I agree with you, when 'it' happens, there won't be a note - it will just happen.
These types of incidents sure do cause plenty of disruption and monetary costs associated with it.